So we have any one good with outboard electrics, I have a yamaha f40 that won't start and I'm getting a weak spark.
So far I have tested the stator plate as I think that is where the issue is and I'm getting a reading of 6ohms on the power could 25v ac and 679 ohms on the charge coil. Can anyone offer any pointers but I think it's shot

Not being a smart-ass but with Yamaha's as dependable as they are..when something go's wrong, unless a reply from someone who's had the same problem/fix, Go to the manual. Actually quite odd a Yam will muck-up without some kind of help. I run a small merc, but I know mercs and some o the merc weak pints (coils) namely. But with an engine as dependable as a Yam...go to the service manual or take it to a reputable yam service shop. Good luck.

Granted my lump of premix burning history uses older school HT tec, but I have found on two occasions the connector in the lead eventuasllty comes loose form the cable itself.....

Also have you changed the plugs- I meggered mine for a laugh & was gobsmacked as to how much less resistance between the business end & earth there was on a 1YO plug.... One I tried had been in the lawnmoeer for years was almost dead short for the High voltage......